Chris Kerbs was definitely not the US CISO. He was the director of CISA, the Cybersecurity and Infrastructure Security Agency. CISO of the US is usually a meaningless figurehead, Krebs actually did things.
Yeah I just had an awkward conversation with a relative who works for a company that has a on site email server running exchange. When I asked him had he patched or upgraded it he said no Microsoft does all that. Grim.